Subdrainage pipe



Aug. 3, 1937. D. B. DxMlcK SUBDRAINAGE PIPE Filed March l0, 1957 Bnventor Gttornegf Patented Aug. 3, 1937 yUNITED STATES tessuto PATENT OFFICE SUBDRAINAGE! PIPE.

Application March 10,

6 '.Claims.

The present invention relates to drainage.l means, and more particularly to a drainage pipe and a novel construction of pipe section to. make up the drainage pipe.

An object of this invention is to providel a drainage pipe section which will efciently. and.

quickly carry off drainage water in variousin.- stallations, such as from a large area used as an airport field, a golf course, municipal playground, baseball field, railroad freight yards and the like, as Well as for use along railroad rights-of-way and in the construction of class A paved highways.

Another object of the present invention is to =provide an improved construction of drainage pipe which may take the place of the now widely used steel perforated pipe which has openings in its lower side and depends upon a proper pressure ahead of the water before the latter enters the drainage pipe through vthe openings.

Another object of the present invention is to provide a drainage pipe section which is of substantially semi-cylindrical construction having its sectional edges directedupwardly and closed across its top by a trough or` concave cradle in..

the form of a web or wall which extendsentirely across the upper side of the pipe section and which is inclined from one end thereof near its.

upper edge gradually to the opposite end of the rsection ata point spaced below the edge sufficiently to provide water receiving openings between the abutting ends of the pipe sections.

Another object of the present invention is;to provide a drainage pipe section of the bell and spigot type which has the top trough wall thereof terminating at the top edge of the pipe section in spaced relation to the enlarged or bell portion of the section so that the trough walls of adjacent sections are displaced vertically at their adjacent ends to admit water by gravity into the bases of the pipe sections for carrying off the water by gravity when the sections are assembled in a downwardly sloping line or grade.

The invention also provides a cast iron structure which. eliminates the corrosion and rusting of the steel pipes, a construction which rapidly and .eiectively carries off the. drainage water which is fed to the drainage device by gravity and not dependent upon hydrostatic pressure, and va device which cannot easily become clogged or choked incident to the accumulation of `silt orthe like which is found to usually clog up and render ineffective drainage pipes and the like heretofore used.

With the foregoing and other objects in view,

1937,v Serial No. 130,206

the invention will be more fully described hereinafter; and willr be more particularly pointed out inthe claims appended hereto.

In the drawing, wherein like symbols refer to like or corresponding parts throughout the several views.

Figure 1 is a perspective view of a pair of drainage pipe sections assembled for use. l

Figure 2 is a vertical longitudinal section taken through the same on the line 2 2 of Figure 1.

Figure 3 is an enlarged transverse section taken through one of the sections on the line 3-3 of Figure 1, and.

Figure 4 isa transverse section taken -through a trench having thedrainage pipe of kthis invention disposed therein.

Referring .now to the drawing, there is shown in Figures 1 and 2 a drainage pipe made up of a number of sections I constructed according to the present invention. Each section IIJ is of cast iron, or other suitable material, and is substantially semi-circular in cross-section so as to provide depth and interior cross-sectional area to the pipe section. The semi-cylindrical section is adapted to be positioned in a trench with 'its lower roundedfbottom or surface toward the bottom ofthe trench, and with this construction the pipe section may have considerable width as compared with the usual cylindrical pipes now employed, and may thus cover a greater horizontal surface area for drainage to more effectively catch the drain water and carry it oiT by gravity through the pipe. rality of. the sections I0 may each have a bell I I at one end and a spigot portion I2 aty its opposite end so that the pipe sections interfit as shown in Figures 1 and 2 to provide a drainage pipe line of desired length.

Instead of `Lperforating the lower curved wall of the pipe section I0 as is common in drainage pipes,` and which are found .to be a great source of annoyance in clogging and the like, the present invention provides a top wall I3 which extends between the upper edge portions of thev The pipe, comprising a pluthe bell I I at one end of the section to the spigot I2 at the other end of the section, the slope being a gradual slow one so as to impart gravitational movement to the drainage water settling upon the wall I3 to ow in the desired direction with respect to the pipe section.

When a plurality of the pipe sections IU are assembled it will be observed, particularly from Figure 2, that the trough or upper surface' of the wall I3 of one section l0 is inclinedd'ownwardly toward the adjacent section and termi-.2. nates in slightly spaced relation below the up-l flcations may be made in the details of conper end of the next adjacent wall I3. This provides a drainage inlet opening I4 through which water collected on the upper surfaces of the walls I3 may enter the interior or vbodyportion of the drainage pipe. drainage pipe is inclined in the direction of the slope of the wall I3 so that the water which is admitted to the interior of the built up drain--I age pipe through the openings I4, will flow byA tures, the. ground will, therefore, be kept relatively dry as there will be no accumulation of entrapped water, and the ground areas thereby drained will be rapidly drained as the water is carried off quickly and efficiently from the very moment of accumulation.

It is only necessary to have the surface level of the accumulated water of a height suiicient to flow over the lateral edges of the pipe sections I so that the water may enter the trough wall I3. I-Ieretofore, it has been necessary for a large body of water tol accumulate with a relatively high surface level so as to obtain the necessary head or pressure of the water against the under side of the drainage pipe to force the water through the perforation in the pipe, dislodge silt and other accumulations and thus veffect at least a partial flow of the water through the drainage system.

The provision and disposition of the concave upper wall I3 of the semi-cylindrical pipe section performs not only the function of reinforcing and strengthening the lateral walls of the body section IU, but also serves to accumulatev a relatively large percentage of the drain water by gravity and direct the collected water to the opening I4 and thence into the interior or body -of the pipe section in the direction of gravitational flow oi the water in the pipe section. These features promote continued equal and efficient drainage of all water which gravitates stallation, and in Figure 4 the drainage pipe isshown as installed below the ground surface I5 .ina trench i6 of suitable width to accommodate the drainage pipe and which may have a bottom` of the desired slope, and in which the drainage pipe is installed. Gravel I I of other suitable material is iilled into the trench IIwabout and beneath the drainage pipeto ythe'desired extent l age pipe.

As shown in Figure 2, the" and the gravel body I1 may be of particles of various sizes to permit seepage of Water downwardly in the trench I5 to the top of the drain- It will be noted that the drainage pipe is relatively wide as compared with the usual cylindrical or round pipe indicated by the broken line I8 in Figure 3 so that the drainage pipe of this invention is relatively wide or broad at its top-to insure the collection of a relatively large volume of the downwardly seeping drain water for carrying the same directly off.

"'It' is obvious that various changes and modistruction and design of the above specically descope'of the following claims:

Whatisclaimed is:

1. A drainage pipe comprising a plurality of pipe` sectonsdisposed in endwise abutting relation, `each pipe section having a semi-cylindrical bodyportion with a transversely concave closure Wall extending between theupper edge portions of the4 body portion, said closure wall being inclined from end to end of the pipe section with the lower end of one section adapted to terminate `in spaced relation below the upper end of an adjacent section whereby to provide an inlet opening or passage of drain water accumulating on the upper walls of the sections.

2. A drainage pipe section comprising a semicylindrical body portion having a rounded lower Wall and provided with a trough wall extending between the upper edge portions of the body portion of the section, said trough wall being inclined from end to. end of the pipe section for directing drain water collected in the trough wall toward one end of the section.

3. A drainage pipe section comprising a cast iron .semi-cylindrical body portion having a spigot on one end and a bell on its opposite end, said cast iron body portion having an integral tcp wall extending throughout substantially the length ofthe body portion and inclined from end to end of the body portion, said top Wall being transversely concave to direct accumulated water on the top wall centrally of and toward one end of the section.

4. A drainage pipe comprising a plurality of bell and spigot sections disposed in endwise intertting engagement, said sections being of substantially semi-cylindrical construction with their rounded surfaces lowermost and provided with top walls extending throughout the length and width of the sections between the upper edge portions thereof, said top walls being transversely-'concave to provide troughs for the accumulation of drainage water gravitating on the tops ofthe pipe sections, said top walls of the pipe sections all inclined downwardly from end to end of the sections and disposed with the lower end of a top wall of one section spaced beneath the-upper end of the top wall of an adjacent section to provide an opening through which the accumulated drain water on the top wall may pass to the interior of the drainage pipe.

5.A drainage pipe section comprising a hollow body portion having a lower imperforated wall and provided with a wall crossing the top of the body portion and adapted to receive thereon'water gravitating upon the drainage pipe section, said top wall of the pipe section being inclinedfrom one end of the section toward the other to direct the drainage Water over the top Wall to one end of the section.

6. A drainage pipe comprising a plurality of hollow body portions having top Walls adapted to receive drainage water gravitating thereon, the top Walls of the sections being inclined from end to end of the sections with the lower end of the top Wall of one section spaced below the of the sections to the interior of the drainage 5 DANIEL B. DIMICK.

pipe. 

